$\frac{x^{-1}}{4x^4}$
$\cos a\sec a=1$
$\lim_{x\to\:3}\left(\frac{2x}{x^2-3x}\right)$
$x^2+7x^2+10x-6\left(x+3\right)$
$\lim_{x\to0}\left(\frac{\left(x+3\right)\sin\left(3x\right)}{5x\left(x-6\right)\left(x+5\right)}\right)$
$\frac{72}{8}$
$-c^{3\:}.\:c^8$
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